feat: add bulletizeMarkdown post-processor with tests

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/test/utils/citationParser.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { processCitations } from '../../utils/citationParser'
+import { processCitations, bulletizeMarkdown } from '../../utils/citationParser'
 import type { SourceMetadata } from '../../types'
 
 const mockSources: SourceMetadata[] = [
@@ -145,3 +145,40 @@ describe('processCitations', () => {
     expect(result).toContain('/pdf-viewer')
   })
 })
+
+describe('bulletizeMarkdown', () => {
+  it('converts paragraphs to bullet points', () => {
+    const input = 'First paragraph.\n\nSecond paragraph.\n\nThird paragraph.'
+    const result = bulletizeMarkdown(input)
+    expect(result).toBe('- First paragraph.\n- Second paragraph.\n- Third paragraph.')
+  })
+
+  it('preserves content that already has bullet points', () => {
+    const input = '- Already a bullet\n- Second bullet'
+    const result = bulletizeMarkdown(input)
+    expect(result).toBe(input)
+  })
+
+  it('preserves numbered lists', () => {
+    const input = '1. First item\n2. Second item'
+    const result = bulletizeMarkdown(input)
+    expect(result).toBe(input)
+  })
+
+  it('handles single line', () => {
+    const input = 'Just one line.'
+    const result = bulletizeMarkdown(input)
+    expect(result).toBe('- Just one line.')
+  })
+
+  it('handles text with inline newlines (soft wrap)', () => {
+    const input = 'Line one\nstill same paragraph.'
+    const result = bulletizeMarkdown(input)
+    expect(result).toBe('- Line one still same paragraph.')
+  })
+
+  it('returns empty string for empty input', () => {
+    expect(bulletizeMarkdown('')).toBe('')
+    expect(bulletizeMarkdown('  \n  ')).toBe('')
+  })
+})

frontend/src/utils/citationParser.ts

@@ -1,6 +1,19 @@
 import type { SourceMetadata, SubQuestionSources } from '../types'
 import { getPdfViewerUrl } from '../lib/api'
 
+export function bulletizeMarkdown(text: string): string {
+  if (!text.trim()) return ''
+
+  const lines = text.split('\n')
+  const hasBullets = lines.some(
+    (line) => /^(\s*[-*+]|\s*\d+[.)]\s)/.test(line.trimStart())
+  )
+  if (hasBullets) return text
+
+  const paragraphs = text.split(/\n{2,}/).filter((p) => p.trim())
+  return paragraphs.map((p) => `- ${p.replace(/\n/g, ' ').trim()}`).join('\n')
+}
+
 const SUPPORTED_EXTENSIONS = /\.(pdf|docx|txt)$/i
 
 function stripExtension(filename: string): string {